TOPAS: Tropospheric Optical AbsorptionSpectroscopy

The aim of the Tropospheric OPtical Absorption Spectroscopy (TOPAS) subproject ofEUROTRAC was the development of high performance instruments based on Differential Optical Absorption Spectroscopy (DOAS) in order to measure minor tropospheric constituents using their absorption properties in the ultraviolet, visible and near infrared.